# Problem of the day! (Analytic Geometry)

A triangle is defined by the points (2,6), (-2,2) & (5,2). Determine the area of the triangle in meters if one unit is equal is equal to one meter.

Graph:

Solution:

Using distance formula:

A = [(-2-2)^2 + (2-6)^2 ]^0.5 = 5.657 m

B = [(2-5)^2 + (6-2)^2]^0.5 = 5 m

C = [(5-(-2))^2 + (2-2)^2]^0.5 = 7 m

Using Heron’s formula:

Area = [S(S-A)((S-B)(S-C)]^0.5

S = Semi Perimeter = (A+B+C) / 2

S = (5.657 + 5 + 7) / 2 = 8.83 m

Area = [8.83(8.83-5.657)( 8.83-5)( 8.83-7)]^0.5

Area = 14 sq. m. (Answer).

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